.Site.Authors not implemented?

I define my own structure for the .Site.Author in config.toml and use that in my custom partials that override the internal templates.

Example in config.toml:

[Author]  
  name = "Foo Bar" 
  email = "Foo.Bar@example.com"   
  bio = "Foo Bar's bio."  
  [Author.photo]    
    url = "images/me.jpg" 
    width = 400     
    height = 400